package com.itheima.student.system05.entry;

import com.itheima.student.system05.domaiin.Student;

import java.util.ArrayList;
import java.util.Scanner;

public class StudentEntry {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        ArrayList<Student> list = new ArrayList<>();
        loop:
        while (true) {
            System.out.println("--------欢迎使用学生管理系统--------");
            System.out.println("1.添加学生");
            System.out.println("2.修改学生");
            System.out.println("3.删除学生");
            System.out.println("4.查看学生");
            System.out.println("5.退出");
            System.out.println("请输入你的选择");
            String choice = sc.next();
            switch (choice) {
                case "1":
                    addStudent(list);
                    break;
                case "2":
                    updateStudent(list);
                    break;
                case "3":
                    deleteStudent(list);
                    break;
                case "4":
                    findStudent(list);
                    break;
                case "5":
                    System.out.println("退出");
                    break loop;
                default:
                    System.out.println("您的输入有误,请重新输入:");
                    break;
            }
        }
    }

    private static void addStudent(ArrayList<Student> list) {
        Scanner sc = new Scanner(System.in);
        System.out.println("请输入学生的学号:");
        String sid = null;
        while (true) {
            sid = sc.next();
            int index = getIndex(sid, list);
            if (index >= 0) {
                System.out.println("此学号与系统中的重复,请重新录入:");


            } else {
                System.out.println("请继续下一程序:");
                break;
            }
        }
        Student student = getStudent(sc, sid);
        list.add(student);
        System.out.println("信息已录入!");

    }

    private static Student getStudent(Scanner sc, String sid) {
        System.out.println("请输入学生的姓名:");
        String name = sc.next();
        System.out.println("请输入学生的年龄:");
        int age = sc.nextInt();
        System.out.println("请输入学生的性别:");
        String gender = sc.next();
        System.out.println("请输入学生的生日:");
        String birthday = sc.next();
        Student student = new Student();
        student.setSid(sid);
        student.setName(name);
        student.setAge(age);
        student.setGender(gender);
        student.setBirthday(birthday);
        return student;
    }

    public static void updateStudent(ArrayList<Student> list) {
        Scanner sc = new Scanner(System.in);
        while (true) {
            System.out.println("请输入学生的学号:");
            String sid = sc.next();
            int index = getIndex(sid, list);
            if (index >= 0) {
                System.out.println("此学号系统已存在,可以修改:");
                Student student = getStudent(sc, sid);
                list.set(index, student);
                System.out.println("该学生信息已修改!");
                break;
            } else {
                System.out.println("您输入的学号系统不存在,请重新输入:");
            }
        }



    }

    public static void deleteStudent(ArrayList<Student> list) {
        Scanner sc = new Scanner(System.in);
        while (true) {
            System.out.println("请输入学生的学号:");
            String sid = sc.next();
            int index = getIndex(sid, list);
            if (index >= 0) {
                list.remove(index);
                break;
            } else {
                System.out.println("系统没有此学生,不必删除!");
            }
        }
        System.out.println("删除成功!");
    }

    public static void findStudent(ArrayList<Student> list) {
        if (list.size() == 0) {
            System.out.println("该系统中没有储存学生数据!");
        }
        System.out.println("学号" + "\t" + "姓名" + "\t" + "年龄" + "\t" + "性别" + "\t" + "生日");
        for (int i = 0; i < list.size(); i++) {
            // list.get(i)
            Student student = list.get(i);
            System.out.println(student.getSid() + "\t" + student.getName() + "\t" + student.getAge() + "\t" + student.getGender() + "\t" + student.getBirthday());

        }

    }

    public static int getIndex(String sid, ArrayList<Student> list) {
        for (int i = 0; i < list.size(); i++) {
            // list.get(i)
            Student student = list.get(i);
            if (student.getSid().equals(sid)) {
                return i;
            }

        }
        return -1;
    }
}
